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Undetected by Ivan Berryman.

En route to the Ruhr Dams on the night of 16/17 May 1943, P/O W C Townsend, demonstrating great skill, flew his aircraft, ED886(G) 'O'- Orange below tree-top height through a forest firetrap on his way to the Ennepe Dam, a feat carried out by moonlight alone. AJ-O made it successfully to its target where the Upkeep bomb was observed to hit the dam, but with no effect, before returning safely to base the following morning.

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*The value given for each signature has been calculated by us based on the historical significance and rarity of the signature. Values of many pilot signatures have risen in recent years and will likely continue to rise as they become more and more rare.

Joining the RAF in 1940, George Johnson served with 97 Squadron before joining 617 Squadron. Bomb aimer on American Joe McCarthys Lancaster AJ-T, they attacked the Sorpe Dam, for which he was awarded the DFM. Commissioned a few months later, George retired from the RAF in 1962.

The Avro Lancaster arose from the avro Manchester and the first prototype Lancaster was a converted Manchester with four engines. The Lancaster was first flown in January 1941, and started operations in March 1942. By March 1945 The Royal Air Force had 56 squadrons of Lancasters with the first squadron equipped being No.44 Squadron. During World War Two the Avro Lancaster flew 156,000 sorties and dropped 618,378 tonnes of bombs between 1942 and 1945. Lancaster Bomberss took part in the devastating round-the-clock raids on Hamburg during Air Marshall Harris' "Operation Gomorrah" in July 1943. Just 35 Lancasters completed more than 100 successful operations each, and 3,249 were lost in action. The most successful survivor completed 139 operations, and the Lancaster was scrapped after the war in 1947. A few Lancasters were converted into tankers and the two tanker aircraft were joined by another converted Lancaster and were used in the Berlin Airlift, achieving 757 tanker sorties. A famous Lancaster bombing raid was the 1943 mission, codenamed Operation Chastise, to destroy the dams of the Ruhr Valley. The operation was carried out by 617 Squadron in modified Mk IIIs carrying special drum shaped bouncing bombs designed by Barnes Wallis. Also famous was a series of Lancaster attacks using Tallboy bombs against the German battleship Tirpitz, which first disabled and later sank the ship. The Lancaster bomber was the basis of the new Avro Lincoln bomber, initially known as the Lancaster IV and Lancaster V. (Becoming Lincoln B1 and B2 respectively.) Their Lancastrian airliner was also based on the Lancaster but was not very successful. Other developments were the Avro York and the successful Shackleton which continued in airborne early warning service up to 1992.